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kernel: restrict user threads to worsen priority

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User threads aren't trusted and shouldn't be able to alter the
scheduling assumptions of the system by making thread priorities more
favorable.

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This commit is contained in:
Andrew Boie 2017-10-08 10:11:24 -07:00 committed by Andrew Boie
parent 8e3e6d0d79
commit 5008fedc92
1 changed files with 7 additions and 1 deletions
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8
kernel/sched.c
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@ -285,11 +285,17 @@ void _impl_k_thread_priority_set(k_tid_t tid, int prio)
}
#ifdef CONFIG_USERSPACE
_SYSCALL_HANDLER2(k_thread_priority_set, thread, prio)
_SYSCALL_HANDLER2(k_thread_priority_set, thread_p, prio)
{
struct k_thread *thread = (struct k_thread *)thread_p;
_SYSCALL_OBJ(thread, K_OBJ_THREAD);
_SYSCALL_VERIFY_MSG(_VALID_PRIO(prio, NULL),
"invalid thread priority %d", (int)prio);
_SYSCALL_VERIFY_MSG(prio >= thread->base.prio,
"thread priority may only be downgraded (%d < %d)",
prio, thread->base.prio);
_impl_k_thread_priority_set((k_tid_t)thread, prio);
return 0;
}